It sounds like you've had quite the journey with your new Microsoft Lifecam HD 3000 and the older VX 5000 model. It's frustrating when new hardware doesn't work as expected, especially with issues around software compatibility.
It's interesting that you found the software for both cameras to be the same, even though they are listed under different names. This could be due to the software being a generic driver package for multiple camera models.
It's good to hear that you were able to get the VX 5000 working eventually, even though you received a compatibility message for Windows 8. It's a testament to the versatility of some older devices.
And yes, return policies are a lifesaver in situations like this! Amazon is known for its customer-friendly return policies, making it easier to try out new products without the worry of getting stuck with something that doesn't meet your expectations.
If you have any questions or need further assistance with your cameras or any other tech-related inquiries, feel free to ask!